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    <meta charset="UTF-8">
    <title>jQuery 遍历示例</title>
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    <h1>jQuery 遍历示例</h1>
    <section>
        <ul>
            <li>1.1</li>
            <li>1.2</li>
            <li>
                1.3
                <ul>
                    <li>1.3.1</li>
                    <li>1.3.2</li>
                    <li>
                        1.3.3
                        <ul>
                            <li>1.3.3.1</li>
                            <li>1.3.3.2</li>
                        </ul>
                    </li>
                    <li>1.3.4</li>
                </ul>
            </li>
            <li>1.4</li>
        </ul>
    </section>
    <script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.min.js"></script>
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